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JParanee
04-10-2016, 08:32 PM
I'm assuming I have a 50 gallon tank

I'm running a blue motor

I have only ran the boat in testing and I have not logged any miles yet to get a feeling for distance from a tank

I am planning some trips already so I am curious on some mileage estimates from you guys at cruise....please let me know your experiences

gcarter
04-10-2016, 09:59 PM
OK, I'm in.
At least 100 miles.:)

JParanee
04-10-2016, 10:23 PM
OK, I'm in.
At least 100 miles.:)


George I can always count on you and I was figuring 2 miles a gallon '

that would be great

I am mapping out my Hudson trip and I'm planing on doing 60 mile runs between stops

so far I'm starting to plan the Lake George dust off in June the Thousand islands in July and the Hudson River trip in August

I'll mix some Matyland , Nj Delaware trips in the salt and I should have a novel season

that's if nothing breaks :)

RockyS18
04-10-2016, 10:24 PM
I would normally fill the boat up about every 3 hours of run time with the 565, which includes idling. I've probably squeezed more out of it before but I'm not into taking chances!

JParanee
04-10-2016, 10:28 PM
I would normally fill the boat up about every 3 hours of run time with the 565, which includes idling. I've probably squeezed more out of it before but I'm not into taking chances!


I would be happy with that :)

gcarter
04-10-2016, 10:59 PM
Joe, I'm pretty sure you have a plastic tank. If you do, below is a drawing of it. It says 52 gallons, but some of that won't be be usable.
When I had my tank built, I raised the top by 1" which gave me 62 gallons.
I have no idea what my boat burns. I just fixed one fuel issue, and may need to have some carb work done. I'm looking forward to finding out more. I would love to get 3 MPG. We'll see.

93viperboy
04-11-2016, 05:55 AM
Joe.
I may be interested in doing the Hudson run also. I would want to keep going thru some of the locks and then Pull the boat out around Whitehall. I would Trailer it To Lake George.
Also Lake Winnipesaukee is supposed to have a Donzi Poker Run. They have not announced the date. Gary

CHACHI
04-11-2016, 07:15 AM
At cruise....100 miles easy.

Ken

Greg Guimond
04-11-2016, 10:16 AM
I know that the standard Mercruiser I/O motors drink 89 octane, does the 500 EFI Blue Bulldog race motor require 93 octane? 93 is harder and harder to find on the water these days so factor that in (if it's a requirement) and you have that small 50 gallon gas tank. :yes:

JParanee
04-11-2016, 11:08 AM
I know that the standard Mercruiser I/O motors drink 89 octane, does the 500 EFI Blue Bulldog race motor require 93 octane? 93 is harder and harder to find on the water these days so factor that in (if it's a requirement) and you have that small 50 gallon gas tank. :yes:


It does

can I source 93 along the Hudson ?

JParanee
04-11-2016, 11:08 AM
Joe.
I may be interested in doing the Hudson run also. I would want to keep going thru some of the locks and then Pull the boat out around Whitehall. I would Trailer it To Lake George.
Also Lake Winnipesaukee is supposed to have a Donzi Poker Run. They have not announced the date. Gary


Reach out out and we can talk

thx

RickSE
04-11-2016, 11:28 AM
I know that the standard Mercruiser I/O motors drink 89 octane, does the 500 EFI Blue Bulldog race motor require 93 octane? 93 is harder and harder to find on the water these days so factor that in (if it's a requirement) and you have that small 50 gallon gas tank. :yes:

The 500-EFI blue motors only require 89. The carbed HP 500's may require more octane. I've ran 89 in mine for 10-years.

JParanee
04-11-2016, 12:28 PM
The 500-EFI blue motors only require 89. The carbed HP 500's may require more octane. I've ran 89 in mine for 10-years.


Mine is carbed and I have not tried 89 but I don't think I want to :)

JParanee
04-11-2016, 12:30 PM
Joe, I'm pretty sure you have a plastic tank. If you do, below is a drawing of it. It says 52 gallons, but some of that won't be be usable.
When I had my tank built, I raised the top by 1" which gave me 62 gallons.
I have no idea what my boat burns. I just fixed one fuel issue, and may need to have some carb work done. I'm looking forward to finding out more. I would love to get 3 MPG. We'll see.


George mine is metal

Pat McPherson
04-11-2016, 01:04 PM
I do 2 long runs per year and 2 miles per gal average is a good save number for my stock carb 502...

I've done my Block Island trip one way on 20gal and its 50-55miles. This is a cruise in a lot of open water with and average of about 3000rpm. I haven't taken a chance on the return trip without a refill...

On the CT River Run, I'd say 3600+rpm for 60-65 miles and I burn 32-35gal...

I've not ever been able to pump more than 45gal into my tank. Not ever run it totally dry though. I run 89 with MSD ignition and timing set 8 to 32 advance...

RickSE
04-11-2016, 01:47 PM
Mine is carbed and I have not tried 89 but I don't think I want to :)

Yeah, I thought you had the carb version & they're supposed to need more octane right? You certainly don't want that thing pinging back there when you can't hear it.

Also, you should have a tag on your fuel tank inside the access panel that will ID the tank but I can't remember if they put the capacity on the tag. It's probably a RDS tank.

gcarter
04-11-2016, 02:04 PM
George mine is metal

OK, here's a copy of the aluminum tank, it says 55 gallons. You should be able to use 50 of it.

JParanee
04-11-2016, 02:32 PM
OK, here's a copy of the aluminum tank, it says 55 gallons. You should be able to use 50 of it.


Thanks guys

im looking forward to finding out :)

just trying to plan some legs to some runs

Greg Guimond
04-11-2016, 03:26 PM
The 500-EFI blue motors only require 89. The carbed HP 500's may require more octane. I've ran 89 in mine for 10-years.

I did not know that the 500 EFI ate 89 octane and liked it while what I would assume is the " years older" HP500 carb motor needs to eat 93 to live a long life. How many hours do you have on your 500 EFI Rick ?

RickSE
04-11-2016, 04:30 PM
...How many hours do you have on your 500 EFI Rick ?

270-hours. The spec tag on the intake for the 500-EFI's actually says 87 is all that's required & from what I've heard you'll only get more soot on the transom if you run higher octane. The compression is way down at 8.75:1 on these motors but it looks like the HP500 is also in that range. We also boat at 3,600' elevation which also drops the octane needs a little.

HP500 Specifications :
Propshaft Horsepower: 470/350
Displacement (Liter/CID): 8.2/502
Cylinders: V-8
Bore (in/mm): 4.47/113
Stroke (in/mm): 4.00/102
Compression Ratio: 8.75:1
Fuel Requirements: 87 Posted Octane (R+M)/2
Full Throttle RPM Range: 4800-5200
Ignition Type: Thunderbolt V
Alternator (amps/watts): 55/776
Length (in/mm): 38.3125 /973
Width (in/mm): 32.75/832
Height (in/mm): 23.5/597
Weight (lbs/kg): 1305/592
Warranty: 1-year limited, 3-year limited corrosion

HP500EFI Specifications

Propshaft Horsepower: 470/350
Displacement (Liter/CID): 8.2/502
Cylinders: V-8
Bore (in/mm): 4.47/113
Stroke (in/mm): 4.00/102
Compression Ratio: 8.75:1
Fuel Requirements: 87 Posted Octane (R+M)/2
Full Throttle RPM Range: 4800-5200
Ignition Type: Digital
Alternator (amps/watts): 60/847
Length (in/mm): 34.3125/872
Width (in/mm): 33.75/857
Height (in/mm): 22.0625/560
Weight (lbs/kg): 1305/592
Warranty: 1-year limited, 3-year limited corrosion

HP500 Bulldog Specifications

Propshaft Horsepower: 470 (350 kw)
Displacement (Liter/CID): 8.9/542
Cylinders: V-8
Bore (in/mm): 4.44/113
Stroke (in/mm): 4.375/111
Compression Ratio: 8.6:1
Fuel Requirements: 87 Posted Octane (R+M)/2
Full Throttle RPM Range: 4800-5200
Ignition Type: Thunderbolt V
Alternator (amps/watts): 55/776
Length (in/mm): 47.5/1207
Width (in/mm): 32.75/648
Height (in/mm): 25.5/648
Weight (lbs/kg): 1540/699
Warranty: 1-year limited, 3-year limited corrosion

JParanee
04-11-2016, 05:07 PM
My motor has been gone over a bit

my distributer is not stock

It has Bullet/Ultradyne cam, hydraulic roller lifters, and pushrods. JE flatop pistons, bored 30 over ,Crane gold 1.7 ratio rocker arms, 088 rectangular port heads with inconel valves, and a dart single plane intake. IMCO Powerflow exhaust


my mechanic said if I were to run 87 consistently he would want to detune it a bit.....I would imagine that would mean adjust the timing etc

I run super in my lawnmower so if possible I will look for higher octane

most marinas I have experience with have super and most the time I can pull up to a pump so I'm only worried on the Hudson run but if I start out with a full tank I should only need to fill up a few times before I get back to better gas

RickSE
04-11-2016, 05:33 PM
Yeah, I'd just stick with the 93 then. Even if you have to top off a tank of 93 with a little 87-89 it should be fine til you could get back to some 93.

Greg Guimond
04-11-2016, 05:45 PM
Given the big price difference in gas based on octane, why would you run 93 octane if the motor calls for and is calibrated to run 89 octane?

gcarter
04-11-2016, 05:46 PM
My engine was built by a local, very successful drag racer.
It's based on a Dart block w/4.5" bore X 4.0 stroke.
Forged, flat top pistons @ 9.25 CR.
large rectangular port heads, inconel valves
Comp hydraulic flat tappet cam (I don't remember the grind)
Crane gold rockers
Dual plane intake, Holley 4150 850 CFM carb
Gil manifolds, w/Corsa risers and Merc pneumatic Captains Call diverters.
Merc T-Bolt IV ignition.
I have very few hours and am still making improvements.
And yes, I run premium.

JParanee
04-11-2016, 09:26 PM
Given the big price difference in gas based on octane, why would you run 93 octane if the motor calls for and is calibrated to run 89 octane?


I don't think mine is calibrated to run on 89 anymore :)


George

the tank is marked 55 gallons

Carl C
04-13-2016, 07:54 AM
I average two miles per gallon. An 80 mile run to Put-in-Bay is no problem. A 100 mile run up into Lake Huron is pushing my luck so I either buy a little gas at a gas dock or take 10 gallons in plastic cans. I have never run out of gas on the water but have run it down to only two gallons left in the tank. I carry BoatU.S. towing insurance which also covers fuel delivery but I have never needed it. I have a 525 that calls for, and likes, 87 octane.

miike
04-24-2016, 11:09 PM
I can get 3-3.5 mpg. HP500 is 87 octane rated but I have my timing up and run 93. Gas is cheap right now, enjoy it while it lasts!

Pismo
04-27-2016, 02:07 PM
I have never paid attention to fuel usage. I would be too depressed. I go to the gas dock every time I turn around it seems and have only a stock boat..

undertaker
04-28-2016, 09:47 AM
I have never paid attention to fuel usage. I would be too depressed. I go to the gas dock every time I turn around it seems and have only a stock boat..

Sorry for the hijack, but PISMO I believe you live on Lake George, have you ever been to the Dustoff or Fall picnic....just curious trying to place your boat and wondering if we have met at one of these events.....

Again sorry for the randomness and hijack:)